US 10,477,577 B2 · RACH power offset

Abstract

A wireless device receives at least one radio resource control message comprising one or more configuration parameters of a cell. A control order for transmission of a random access preamble is received via the cell. A transmission power is determined for the random access preamble based on a pathloss measurement. When the one or more configuration parameters comprise one or more parameters of a channel state information reference signal (CSI-RS) for the cell: the pathloss measurement is based on the CSI-RS; and the determining the transmission power employs a power offset value indicated by the one or more configuration parameters. When the one or more configuration parameters do not comprise CSI-RS parameters for the cell: the pathloss measurement is based on at least one synchronization signal; and the determining the transmission power does not employ the power offset value. The random access preamble is transmitted based on the transmission power.

Claims20

Dependent claims

A method comprising:

receiving, by a wireless device, at least one radio resource control message comprising one or more configuration parameters of a cell;
receiving, by the wireless device, a control order for transmission of a random access preamble via the cell;
determining, for the random access preamble, a transmission power based on a pathloss measurement, wherein:
when the one or more configuration parameters comprise one or more parameters of a channel state information reference signal (CSI-RS) for the cell:
the pathloss measurement is based on the CSI-RS;
and
the determining the transmission power employs a power offset value indicated by the one or more configuration parameters;
and
when the one or more configuration parameters do not comprise CSI-RS parameters for the cell:
the pathloss measurement is based on at least one synchronization signal;
and
the determining the transmission power does not employ the power offset value;
and
transmitting the random access preamble based on the transmission power.

11 more elements

Dependencies are inferred from the claim text.

RACH power offset

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RACH power offset

Life of this patent

Abstract

Claims20